Bug 2497554 (CVE-2026-59710) - CVE-2026-59710 showdown: Showdown: Stored Cross-Site Scripting via unescaped table header ID attributes in markdown
Summary: CVE-2026-59710 showdown: Showdown: Stored Cross-Site Scripting via unescaped ...
Keywords:
Status: NEW
Alias: CVE-2026-59710
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-06 22:03 UTC by OSIDB Bzimport
Modified: 2026-07-08 10:57 UTC (History)
29 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
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Description OSIDB Bzimport 2026-07-06 22:03:05 UTC 
showdown contains a stored cross-site scripting vulnerability in the parseHeaders function of src/subParsers/makehtml/tables.js that fails to properly escape table header ID attributes. Attackers can inject arbitrary HTML and script-executing SVG elements through double-quote characters in markdown table headers, achieving stored XSS when untrusted markdown is rendered with the default github flavor configuration.
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